(1991). Survey of Income and Program Participation (SIPP) 1987 Full Panel Research File United States Department of Commerce. Bureau of the Census. [electronic resource].
Cita Chicago (17th ed.)Survey of Income and Program Participation (SIPP) 1987 Full Panel Research File United States Department of Commerce. Bureau of the Census. [electronic Resource]. 1991.
Cita MLA (9th ed.)Survey of Income and Program Participation (SIPP) 1987 Full Panel Research File United States Department of Commerce. Bureau of the Census. [electronic Resource]. 1991.
Atenció: Aquestes cites poden no estar 100% correctes.